颅内动脉瘤的MR诊断

目的:探讨MR对颅内动脉瘤的诊断价值,提高颅内动脉瘤MR及临床表现的认识。方法:回顾性分析8例颅内动脉瘤患者的MR及临床表现资料,男3例,女5例,年龄2.5～70岁,平均48.1岁,所有病例均经临床或DSA证实。突发头痛、呕吐4例,双眼视力障碍2例,间歇性头痛、头晕2例。所有患者均行MR平扫及增强扫描。结果:本组8例患者共发现动脉瘤8处,均为单发,位于鞍上池附近,圆形或类圆形,大小约0.7cm×0.5cm×0.6cm～2.2cm×2.4cm×2.5cm不等;信号混杂,T1WI以等、高信号为主,T2WI为低、等或高信号,7例可见附壁血栓;增强扫描病灶信号从内到外表现一定层次感:内部血流强化呈明显高信号,新月形附壁血栓强化不明显或轻度强化,最外层瘤壁成环形强化。结论:作为无创性影像学检查手段,MR对颅内动脉瘤具有重要诊断价值。

Diagnosis of MRI in the intracranial aneurysm

Objective：To explore the application values of MRI for intracranial aneurysms,and to improve the understanding of its MRI appearance and clinical findings.Methods：Characteristic MRI appearance and clinical data of 8 patients（include 3 males and 5 females,aged from 2.5 years to 70 years,mean age 48.1 years） with intracranial aneurysms proved by clinics and/or DSA were retrospectively analyzed.The clinical symptoms included headache and vomiting（n=4）,blurred vision（n=2）,intermittent headache and dizziness（n=2）.All patients underwent MR plain and contrast-enhancement scanning.Results：8 intracranial aneurysms were detected,locating near the suprasellar cistern,round or round-like in shape, the size ranged from 0.7 cm×0.5 cm×0.6 cm～2.2 cm×2.4 cm×2.5 cm.All aneurysms revealed heterogeneous signal intensity,dominated by iso-or hyperintensity on T1WI;hypo-,iso-or hyperintensity on T2WI.Mural thrombus were found in 7 cases.The signal of lesions revealed layer＇s appearance from the inner to the outer on the contrast-enhanced T1WI： enhanced blood revealed hyperintensity,mural thrombus revealed crescent with no or mild enhancement,the most outer layer revealed cirlcular enhancement.Conclusion：MRI is the optimal modality in diagnosing intracranial aneurysms as a noninvasive imaging method.